Necromancer's summons

It seems that the summoning of the necromancer's skeletons prevents further respawn of the creeps used to.So for example after summoning five skeletons from banditscout-corpses no new banditscouts will respawn.

Possible Solutions:- Might the creepspawnsystem depending on the corpses of the creeps and not only the kill?- Counting of all the creepunits in the areas playerunits are in. If the number decreases - respawn some creeps.